My car has finally logged a fault code

[emocionR225]

Well what can I say

After months of wondering if I am going mad feeling like my car's turbo only seems to work half the time and 3 visits to Seat, one visit to JBS and a few trips to see m0rk I drove up to Stealth racing yesterday; we were planning to swap a new throttle body onto my car to see if it made any changes. Anyway we put the new throttle body on, plugged in the laptop with the intetion of setting off for a run, and low and behold, my car had logged a fault code!

The code was either 17964 or 17958 (should have wrote it down but will come to that later) which is something to do with a pressure loss (the message with the code was check DV) Bearing in mind the car has a new bosch DV on it we put a Forge unit on, deleted the fault code but it still came back. After some experimenting we noted that the car would boost fine until you had to brake; the fault code would pop up each time we slowed down then the car would not boost again properly until the ignition was turned off then on again

Anyway to cut a long story short the code will appear when the car is 'stationary' and the brake pedal is pressed which perhaps points towards a vacuum leak somewhere (feel free to chip in with advice etc) I thanked Vinny as we certainly have made some progress and this guy was very helpful indeed But as my car is still under warranty I have booked it back in with my Seat dealer....they said they couldn't do much without a fault code...well, now they have one.

Russ

 

[NeilC]

Hope you get it sorted mate. You can get a more detailed description of the fault codes here for interest:

http://wiki.ross-tech.com/index.php/Category:Fault_Codes

 

[m0rk]

17964 P1556 Charge Pressure Contr. Negative Deviation
17958 P1550 Charge Pressure Deviation

either of those will suggest a leaky DV

but if it's not leaking - the pipes *must* be poorly

 

[emocionR225]

Thanks guys

Yeah Mark that's right. Like I said we put a Forge 00P on and it still done it

It was interesting how it still threw up the code without even moving :S - just applying the brake pedal made the code appear and we tried it a few times. I recall the code also saying 'loss of pressure between turbo and (I think) manifold'...I could be wrong about the manifold bit...

 

[cheshire cat]

does it have a small non return valve between the brake servo pipe and the control vac line like the diesels do ?

 

[emocionR225]

I've no idea Nic

Maybe some else will know

 

[m0rk]

it does - it's green (not that it's a huge help)

it's on the black pipe that runs from the manifold (inlet) to the brake servo

 

[Feel]

It's got to be something to do with that, hasn't it?

Not sure about the fault code, it might not be entirely to do with the DV but they something throw up stuff that's unrelated/misleading...

Edit: Just been looking at mine - the pipe off the top of the throttle body seems to run to the back of the engine bay, tees into one of the hardlines that then *seems* to run to the master cyclinder.

Not wanting to dash your hopes, but maybe by changing the TB they've disturbed the rubber end of the pipe and perhaps made it worse (hence the fault) or possibly created a different problem

The last 4" that connects to the TB is rubber, and it's pretty "perished" on mine - lots of tiny cracks/splits...

 

[emocionR225]

That would just about be my luck Feel, to now have a 'new' problem as well.

I can only see one pipe on my throttle body though :S and thats the main one that clamps onto it with a jubilee clip.

I can't wait to get shot of this bl00dy car, even if it does get fixed before I die.

 

[ADAMWIGGY]

Hi you might not want to know this but then again you might my car used to throw up this code and the car would go into limp mode 4ish psi rubbish performance. after replacing all various parts the garage i take it too had a ring around and decided that it was prob best to whip off the throttle body give it a good clean and the give it a realignment hey presto car was sorted and drove 100 times better than it ever had done.all im getting at is maybe as said above this fault is relating to the changing of the throttle body and not your original problem. check they have realigned the new TB and see if the codes still there. sorry if this is useless info for you but it might come in handy.

 

[emocionR225]

Thanks for the advice Adam. TB was cleaned and reset by JBS back in July - on the journey home from them the car did not feel any different initially but halfway home it seemed to really perk up and by the time I was home (3hr drive) it felt amazing...then the next day it went back to feeling sluggish. So that's what basically lead to trying a whole new TB on Friday.

The bottom line is my car has had this problem since Christmas, before any swapping of TB's ever took place.

 

[emocionR225]

My car has finally logged a fault code - UPDATE

Well my car went to Seat on Friday with it's fault code.

Mid-day I get a call from the Service chap, who explained that a temp sender which is is mounted on the rear of the turbo had come loose; they believed that this may have been causing the turbo to shut down (thinking it was overheating), which could have resulted in the 'pressure loss' fault code. They therefore secured the temp sender back in tightly and belived the car to be fixed.

Hmmmm...well I was glad that they had found something, so I went and picked the car up yesterday. Upon ignition I noted the car idled a lot more smoothly (it would most of the time have a very slight flutter / warble) and that was no longer evident. I engaged 1st gear and pulled away and you could tell that something had definately improved, the car felt nice and light again and there was no hesitancy or pulsing which it normally has on cold starts. I smiled. Then, out on the road it felt nice and responsive at low revs, like it used to, and after driving enough for the car to warm up, I give it a bit of welly.

To conclude, the car feels a lot nicer to drive but turbo still seems to be lacking the punch I know it's capable of, feeling flat at 4k+, like there is not enough pressure sometimes.

What does evryone think to the plausibility of what the dealer alleged to have found and done? I'm anxious to know how that would tie in with the fault flagging up whenever the break pedal was depressed at Stealth the week before...

 

[NeilC]

This one?

http://www.seatcupra.net/forums/showthread.php?t=97997

 

[emocionR225]

Hi Neil

Well that does seem to be the same one mentioned in that link; a temp sender mounted on the rear of the turbo...aka the EGT sensor)

I am still wondering if this being loose was capable of triggering my pressure loss fault code(?).

 

[sportbilly]

I had a faulty N75 which would make my car go into limp mode when at tick over (no load on the engine)... it gave the same error code you are getting so looks like this code could be a number of things.